In a fanfiction, Spider - Man could get lost in an alternate dimension during a mission. The Avengers then have to find a way to bring him back. While in the alternate dimension, Spider - Man meets different versions of the Avengers and has to fight his way through various challenges to return home.
Well, Tony Stark might be amused and a bit proud. He'd probably see the fanfiction as a testament to how much Spider - Man has grown under his mentorship. Steve Rogers might be a bit confused at first, but then he'd appreciate the creativity and the way it shows the bond within the team. Thor would likely find it all very entertaining and might even want to hear more stories about Spider - Man's adventures in this fictional take.
He could be a new recruit. The Avengers are always looking for new talent, and Spider - Man's abilities would be a great addition. He could start off as a bit of an outsider, trying to fit in with the more experienced heroes.
Spider - Man would likely be confused at first. He respects the Avengers and can't understand why they are suddenly after him. He might try to talk to them, to explain that he's innocent. For example, he could swing up to Captain America and start pleading his case.
Spider - Man would probably be shocked at first. He looks up to the Avengers and being kidnapped by them would be the last thing he expects. He'd likely try to talk his way out, using his quick wit and charm. He might start by asking why they're doing this and try to convince them that they've made a mistake.
Spider - Man would be very confused. He would feel betrayed because he thought the Avengers were heroes he could trust. He could start by asking them why they are doing this. If they don't give him a satisfactory answer, he might try to escape in a sneaky way, using his spider - like abilities to find a weakness in their capture setup while still trying to reason with them.
Spider - Man would probably be defensive at first. He's used to working alone most of the time, and being interrogated by the Avengers would seem unfair to him. He might crack some jokes to ease the tension, but also firmly state that he's a hero too.
One idea could be a fanfiction where Spider - Man has to team up with the Avengers to stop a new villain that is specifically targeting his neighborhood in Queens. This would combine the street - level heroics of Spider - Man with the big - scale action of the Avengers.
One popular trope is the mentorship. Since Spider - Man has a connection with Tony Stark in the movie, fanfictions often expand on this. Another is the 'fish out of water' trope where Spider - Man is out of his comfort zone when dealing with the Avengers' big - scale operations.
Fanfictions sometimes create scenarios where Spider - Man from 'Homecoming' has to prove himself to the established Avengers. His youth and inexperience contrast with the more seasoned heroes. This can lead to interesting character development arcs, such as him learning from the Avengers' combat strategies and they in turn learning from his unique approach to fighting crime on a smaller scale.